Products.isurlinportal has possible open redirect when using more than 2 forward slashes
Impact
A url /login?came_from=////evil.example may redirect to an external website after login.
Standard Plone is not affected, but if you have customised the login, for example with add-ons, you might be affected. You can try the url to check if you are affected or not.
Patches
The problem has been patched in Products.isurlinportal.
- Plone 6.2: upgrade to
Products.isurlinportal4.0.0. - Plone 6.1: upgrade to
Products.isurlinportal3.1.0. - Plone 6.0: upgrade to
Products.isurlinportal2.1.0. - Older Plone versions don't have security support anymore.
Workarounds
There are no known workarounds.
Background
When you are anonymous and land on a page that requires a login, Plone sends you to the login form. After successful login, Plone redirects you back to the page you came from. Various other forms and pages have a similar system.
This could get abused by an attacker to trick Plone into redirecting to a different website. Plone checks the page that would be redirected to. It is only accepted if it is within the Plone site domain or part of a different trusted domain.
The main check for this is in the Products.isurlinportal package. A lot of potentially malicious urls are already safely rejected, but here a loop hole was found.
This was discovered during a penetration test by the CERT-EU Team.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | products-isurlinportal | >= 4.0.0a1, < 4.0.0, >= 3.0.0, < 3.1.0, < 2.1.0, < 2.1.0, >= 3.0.0, < 3.1.0 | 4.0.0, 3.1.0, 2.1.0 |
Referencias
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N- Debilidad (CWE)
CWE-601- Plataforma
- Python (PyPI)
- Paquete
products-isurlinportal- Publicada
- 02.03.2026
- Actualizado
- 11.10.2026 12:19
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-112 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-43gx-6gv6-3jcp - CC BY 4.0
Historial de vulnerabilidades: products-isurlinportal
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 2
- Primera → última
- 08.2021 03.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 1
- Media 1
Divulgaciones por año
- 2021: 1
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 1
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Products.isurlinportal has possible open redirect when using more than 2 forward slashes esta entrada
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